Add global exception handling middleware

Introduces `GlobalExceptionHandlerMiddleware` for managing exceptions in the request pipeline, logging them, and returning JSON error responses. A new project, `DigitalData.Core.Exceptions.Middleware`, is created to house this middleware and related classes. The `GlobalExceptionHandlerOptions` class allows for custom exception registration with specific HTTP status codes, while a new `HttpResponse` record encapsulates status codes and messages for structured responses. The middleware is registered in the `DependencyInjection` class for easy integration.

DigitalData.Core.Exceptions.Middleware/GlobalExceptionHandlerOptions.cs

@@ -0,0 +1,14 @@
+using System.Net;
+
+namespace DigitalData.Core.Exceptions.Middleware;
+
+public class GlobalExceptionHandlerOptions
+{
+    private readonly Dictionary<Type, HttpResponse> _registeredExceptions = new();
+
+    public GlobalExceptionHandlerOptions RegisterException<TException>(HttpStatusCode statusCode, string? message = null) where TException : Exception
+    {
+        _registeredExceptions[typeof(TException)] = new HttpResponse(statusCode, message);
+        return this;
+    }
+}